ENS 44260
ENS Event | |
---|---|
08:16 Apr 9, 2008 | |
Title | 60-Day Optional Notification for Invalid Specified System Actuation |
Event Description | On Wednesday April 9, 2008 at 0416 hours0.00481 days <br />0.116 hours <br />6.878307e-4 weeks <br />1.58288e-4 months <br />, an invalid actuation of the 1B Refueling Floor Ventilation Exhaust Radiation Monitor occurred. The actuation caused a Division 2 Group 6C isolation signal, which caused primary containment isolation valves (PCIVs) to automatically close on the Containment Leak Detector Radiation Monitor (10-S182) and the Drywell Hydrogen/Oxygen Analyzer (10-S205). The 1A, 1C, and 1D channels were unaffected and indicated normal ventilation exhaust radiation levels during the event.
The cause of the event was a failure of the K2 relay in the 1B Refueling Floor Ventilation Exhaust Radiation Monitor. The failed relay has been replaced and the radiation monitor was declared operable on Wednesday April 9, 2008 at 2024 hours0.0234 days <br />0.562 hours <br />0.00335 weeks <br />7.70132e-4 months <br />. The portion of the primary containment isolation system that received an actuation signal functioned successfully. All of the affected open isolation valves automatically closed. The only equipment malfunction during the event was the failed K2 relay. The Division 2 Group 6C isolation was a partial actuation. This event is reportable per 10CFR50.73(a)(2)(iv)(A) since isolation valves for the Containment Leak Detector Radiation Monitor and Drywell Hydrogen/Oxygen Analyzer automatically closed due to an invalid signal. The licensee has notified the NRC Resident Inspector. |
Where | |
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Limerick ![]() Pennsylvania (NRC Region 1) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+1324.57 h55.19 days <br />7.884 weeks <br />1.814 months <br />) | |
Opened: | Mark Arnosky 12:50 Jun 3, 2008 |
NRC Officer: | Howie Crouch |
Last Updated: | Jun 3, 2008 |
44260 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 564642023-02-16T12:05:00016 February 2023 12:05:00
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